bio-causal-genomics-pleiotropy-detection

bio-causal-genomics-pleiotropy-detection is a skill for Claude Code, Codex from PKU-YuanGroup/OpenAI4S. It costs 137 tokens per session (9,262 once invoked), scanned A, a copy of bio-causal-genomics-pleiotropy-detection, MIT.

A guide for testing whether a Mendelian randomization study supports a causal claim when genetic variants may affect outcomes through other pathways.

In plain words
What is it for?
Use it to distinguish uncorrelated from correlated pleiotropy and select statistical methods such as MR-Egger, MR-PRESSO, CAUSE, or LHC-MR.
Why use it?
This problem, called horizontal pleiotropy, can bias results and make an apparent cause-and-effect relationship misleading.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to distinguish uncorrelated from correlated pleiotropy and select statistical methods such as MR-Egger, MR-PRESSO, CAUSE, or LHC-MR.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/pku-yuangroup/openai4s/bio-causal-genomics-pleiotropy-detection
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add PKU-YuanGroup/OpenAI4S --skill bio-causal-genomics-pleiotropy-detection
Clone the repo
git clone --depth 1 https://github.com/PKU-YuanGroup/OpenAI4S

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for bio-causal-genomics-pleiotropy-detection

README.md
[![agentmods](https://agentmods.dev/badge/skills/pku-yuangroup/openai4s/bio-causal-genomics-pleiotropy-detection/github.svg)](https://agentmods.dev/skills/pku-yuangroup/openai4s/bio-causal-genomics-pleiotropy-detection)
Your own site
<a href="https://agentmods.dev/skills/pku-yuangroup/openai4s/bio-causal-genomics-pleiotropy-detection"><img src="https://agentmods.dev/badge/skills/pku-yuangroup/openai4s/bio-causal-genomics-pleiotropy-detection/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for bio-causal-genomics-pleiotropy-detection

Your own site · 80×15
<a href="https://agentmods.dev/skills/pku-yuangroup/openai4s/bio-causal-genomics-pleiotropy-detection"><img src="https://agentmods.dev/badge/skills/pku-yuangroup/openai4s/bio-causal-genomics-pleiotropy-detection.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 137 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 9,262 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 98% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00137 $0.09262
Opus 5 $0.00068 $0.04631
Sonnet 5 $0.00027 $0.01852
Haiku 4.5 $0.00014 $0.00926

Measured 12d ago against content hash f19baa2f2238, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

bio-causal-genomics-pleiotropy-detection scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

98% identical to bio-causal-genomics-pleiotropy-detection — 12 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/bioskills/bio-causal-genomics-pleiotropy-detection/SKILL.md · 445 lines

How it starts

The opening of the file, as written. The whole thing — 445 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Version Compatibility

Reference examples tested with: TwoSampleMR 0.5.11+, MendelianRandomization 0.9.0+, MR-PRESSO 1.0+, CAUSE 1.2.0+, MR-Clust 0.1.0+, MRMix 0.1+, mr.raps 0.4.1+ (GitHub), LHC-MR 0.0.0.9000+ (GitHub), LCV (script-based, no version tag), simex 1.8+.

Before using code patterns, verify installed versions match. If versions differ:

  • R: packageVersion('<pkg>') then ?function_name to verify parameters
  • For GitHub-only packages, check the repo HEAD vs the local install date

If code throws errors, introspect the installed package and adapt the example rather than retrying.

Pleiotropy Detection in Mendelian Randomization

"Validate my MR result against pleiotropic bias" -> Decompose violations of the exclusion-restriction assumption into uncorrelated horizontal pleiotropy (UHP, addressable by Egger / median / mode / MR-PRESSO) and correlated horizontal pleiotropy (CHP, addressable only by CAUSE / LHC-MR / LCV), then run a method battery whose assumptions span both regimes.

  • R: TwoSampleMR::mr() (IVW + Egger + median + mode), mr_pleiotropy_test(), mr_heterogeneity(), mr_leaveoneout(), directionality_test()
  • R: MRPRESSO::mr_presso() for UHP outlier removal + distortion test
  • R: cause::cause() for CHP-aware estimation; mrclust::mr_clust_em() for mechanism-heterogeneous instruments
  • R: MendelianRandomization::mr_conmix() for contamination mixture; MRMix::MRMix() for mixture-of-distributions

UHP vs CHP: The Central Postdoc-Grade Distinction

Horizontal pleiotropy comes in two regimes, and most "standard" MR sensitivity methods address only one of them.

Regime Definition InSIDE assumption Methods that handle it
UHP (uncorrelated horizontal pleiotropy) Pleiotropic effect alpha_j independent of instrument-exposure effect gamma_j Holds IVW (balanced UHP only), MR-Egger, weighted median, weighted mode, MR-PRESSO, MR-RAPS, MR-Mix, contamination mixture
CHP (correlated horizontal pleiotropy) alpha_j correlates with gamma_j through a shared upstream factor (heritable confounder, network mediator) Violated CAUSE, LHC-MR, LCV, MR-Clust (partial), Steiger-filtered MR (partial)

Read the full file on GitHub · 445 lines

Files

What ships with it

6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 445 lines · 137 tokens per session scan A f19baa2f2238

Subscribe to this mod's changes

bio-causal-genomics-pleiotropy-detection is a skill published in the GitHub repository PKU-YuanGroup/OpenAI4S (407 stars, last pushed yesterday), licensed MIT. It adds 137 tokens to every session and 9,262 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 0 findings. It is 98% identical to bio-causal-genomics-pleiotropy-detection, differing in 12 lines, and is treated as a copy.

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